5. Estimate ET, for July 15, 1994, from a field at an elevation of 200 m using Penman's method. The average temperature for July 15 was 16 C, with a Tmax = 22 C and Tmin 10 C. The previous day's average temperature was 14 C and the following day's average temperature was 21 C. The early morning actual vapor pressure on July 15 was 1.3 kPa, the wind speed was 2 m/s, and Rn was 15 MJ/m'd